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NAGtypes :: generalEquations

generalEquations -- random linear combinations of equations/generators

Synopsis

Description

A variety V (that is not necessarily a complete intersection) of codimension k is a component of a complete intersection of codimension k defined by k general linear combinations of any generating set of the defining ideal of V.

This function automates the above construction.

i1 : R = CC[x,y,z];
i2 : F = {x*y, x^2 - y, x*z};
i3 : L = generalEquations(2,F)

                             2                                         
o3 = {(.291061 + .996464*ii)x  + (.878627 + .868574*ii)x*y + (.049867 +
     ------------------------------------------------------------------------
                                                                        2
     .662939*ii)x*z + (- .291061 - .996464*ii)y, (.593785 + .348517*ii)x  +
     ------------------------------------------------------------------------
     (.491959 + .393244*ii)x*y + (.867342 + .238291*ii)x*z + (- .593785 -
     ------------------------------------------------------------------------
     .348517*ii)y}

o3 : List

Ways to use generalEquations :

  • generalEquations(ZZ,Ideal)
  • generalEquations(ZZ,List)